Pine Island Glacier 1986-1988

Pine Island Glacier map

Access Data

Image Information

Velocity data were derived from the Landsat scenes listed below. To view image data select Velocity Map or Data Set Map, or use the links on the overview image.

Raw Images

Satellite Image ID # Path/Row Date Acquired
Landsat 5 5001113008635510 01/113 21 December 1986
Landsat 4 4001113008835310 01/113 18 December 1988

Corner coordinates for Pine Island Glacier reference image

Number of Lines: 3000
Number of Samples: 3155

Upper Left -74.52577S -101.18402W
Upper Right -74.94224S -98.56924W
Lower Left -75.16603S -102.78518W
Lower Right -75.60049S -100.10138W

Data Set Information and Access

Both image co-registraion and velocity vectors are derived using the IMCORR software developed by Scambos et al. 1992 (see Related Publications). Typical co-registration errors are a few pixels. Because this error is constant for any image pair, it is treated as a systematic error within that image pair. Each cross-correlation match has an additional random error, typically about 0.3-0.5 pixels (Landsat resolution is 28.5 meters per pixel). IMCORR measures velocity as displacement divided by time separation, therefore, velocity errors scale as the inverse of the time interval. However, as time separation between the image pair increases, changes in the ice surface (e.g. crevasses, orientations, dunes, shear strain) result in fewer successful correlations.

While error in speed and error in bearing are reported, a more realistic error estimate is the combination of a systematic error of 1.5 pixels (42.75 meters) divided by time separation and a random error of 0.5 pixels (14.25 meters) divided by time separation. The reported speed and bearing errors are derived from the strength of the IMCORR feature correlation for each vector, and are therefore more related to precision than accuracy.

Access the tabular velocity data for the Pine Island Glacier